Duplicator



March 5, 1935.

F. STORCK DUPLIGATORl Filed' Aug. 9, 1953 4 Sheets-Sheet 2 March 5, 1935. F.jw. sTORcK '1,993,699

- DUPLICATOR Filed Aug. 9,' 1935 4 Sheets-Sheet 3 March 5, 1935. F w, STQRCK Y 1,993,699

DUPLI CATOR Filed Aug'. 9, 1933 4 Sheets-Sheet 4 Patented Mar. 5, 1935 UNITED STATES PATENT OFFICE DUPLIoATon Frederick W. Storck, Arlington, Mass., assignor to Standard Mailing Machines Company,4 Everett,

Mass., a corporation Application August 9,

14 Claims.

My invention relates to an apparatus for printing duplicates either from matter imprinted on a gelatin iilm or from a stencil having the matter to be printed cut therein. i

The objects of my invention are as follows:

To construct a simple and inexpensive duplicator that is easy to operate and that is capable of producing duplicate copies at a higher rate of speed than has been possible heretofore by duplicators of this type. Another object is to provide guides for the curved printing platen to prevent longitudinal or lateral movement of the printing platen during its contact with the copy sheet.

A further object of my invention is to provide a spring controlled device to cause an equal degree of pressure of the curved platen and master copy on the copy sheet at all points of their contact therewith. Another object is to provide a supPOlt for the curved platen when in itsinoperative position so the printed duplicate may be easily removed therefrom. And another object is .to provide guides to support the copy paper in a predetermined position so the printed matter may be imprinted on any number of copy sheets in exactly the same position to register accurately with lines or other printed matter. In the drawings Fig. 1 is a top plan view of my duplicating apparatus showing the curved printing. platen resting upon the inclined sheet support. Fig. 2

y is a side elevation of same with the curved printing platen raisel to a vertical position. Fig. 3 is a sectional elevation taken on line 3-3 Fig. 1. Fig. 4 is a cross sectional elevation taken on line 4-4 Fig. 1. Fig. 5 isatop plan view of a modied form of curved printing platen for use with a stencil havingl thepmatter to be duplicated cut therein and an ink pad secured to the platen. Fig. 6 is a sectional view of same taken on line 6 6 Fig. 6. Fig. '7 is an enlarged view of the clamping device for clamping the stencil to the printing platen. v I.

Fig. 8 is an end elevation taken from the left end of Fig.2. Fig. 9 is a sectional elevation on line 9-9 Fig. 8 showing details of the construction of a spring controlled device designed to provide an even pressure of the curved platen at all points of its contact with the copy paper support. Fig.

10 shows another form of copy sheet guide which is secured to one end of the copy sheet support by means of yielding springs. Fig. 11 illustrates another means of obtaining a clearance space for the guides to permit contact of the master copy with the exposed copy sheet as the height of the stock of copy sheets decreases.

The duplicating apparatus consists of the side frames 8-8 the supporting feet9--9 and the inclined sheet support 10, to which the side frames are attached by suitable means such as screws 11-11 etc. or the like. Spacing rods 12-12 etc.

of Massachusetts 1933, Serial No. 684,431

extend between the frames to support them. 13A is a curved printing platen formed with ribs 14-14 at its sides, a bar 15 extends across one Aend of the platen 13 and has rolls 16-16 rotatively mounted on its ends, positioned to contact with the levers 17-17 and swing them upwardly upon their pivot, the bar 15, against the tension of the spring 18. One end. of the spring 18, engages a slot 19 formed in the hub, of the roll 16, its free end is bent to hook over the pin 20.

The curved platen 13 is provided at one end with hooks 21 designed to engage slots in one end of a gelatin lm 22 having the master copy to be duplicated imprinted thereon. The other end of the lm is secured to the hooks 23, whichl are secured to the rotatable bar 24. AThe bar 24 is prevented from free rotation by friction. By rotating the bar 24 the lm 22 is drawn tightly over the surface of the platen 13.

The modified formlof platen 13, 25 and 26 secured on the rods 27, and 28, mounted in the platen 13. The clips 25 and 26, serve to hold the ends of a stencil 29, which has under it the ink pad and which operates in a well known manner. The support l0 is provided with the projecting guides 31-31 etc. against which the copy sheets 32 rest, thus retaining the sheets 32 in a predetermined position, holes 33 are formed in the platen. l0, through which the guides 31 project. v

To provide against lateral and longitudinal movements of the platen 13 during its rocking movement, guides are provided at one of its ends. Preferably the slots 16a are formedv in the side frames 8--8. Rolls are mounted on the bar 15 and -arranged to enter and slide in the slots 16a and guided thereby.

' In Fig. 1l the guides 3l project into the space 34,' which is provided by bending the end of the curved platen 13 upward. In Fig. 10, I mount a. guide 35 on the end of the springs 36, which are secured to the platen 13, preferably by screws 37. As will be observed the platen is rocked downward to bring the master copy into contact with the topmost copy sheet 22, the guide 35 will be pushed downward, returning to its normal position when platen 13 is rocked to inoperative position.

I preferably position the vcopy sheet support 13 slightly inclined as 'a convenience in operating the duplicator and for the further reason, that by inclining the support 10. the copy sheets will better retain a position in contact with the guides 31 'or 35. However, my improved duplicator will operate as effectively if the support l0 is positioned horizontally.

`In practice, the operation of my improved duplicator is as follows: A master copy in reverse is imprinted with copying ink on a gelatin nlm in the usual way, the film 22 is then attached -to the platen 13 by means ofthe hooks 21 and 23. The

has spring clips platen 13 is shown in inoperative position in Fig. 2, it is resting against the bar 12. A plurality of sheets of copy material is then placed upon the support l0, with their ends against the guides 31. The duplicating apparatus is now in condition for operation. By swinging the platen 13 down as shown in Fig. 3, the master copy 22 contacts with the topmost sheet of the stock 32 and producesa duplicate of the master copy on the exposed surface of said sheet. The platen 13 is then returned to the position shown ,in Fig. 2 and the copy sheet stripped from the master gelatin lm, thus completing the duplicating operation.

My invention is not conned to the particular construction shown in the drawings accompanying this specication as various modications may be made therein without departing from the spirit of my invention.

What I claim is:

1. In a duplicator, a frame, a support for copy sheets secured in the frame, means on the support to position the copy sheets, a curved platen movably mounted in the frame, means to guide and limit the movement of the curved platen, means to secure a master copy to the curved platen, spring controlled means to cause the curved platen to contact with the support with a substantially even pressure at all points of their contacting surfaces.

2. In a duplicator, a frame, a support for copy sheets secured to said frame, a curved platen movably mountedin said frame, guides to guide the movement of said curved platen, rolls mounted on one end of said curved platen, spring controlled levers pivoted to the frame adapted to contact with the rolls on the curved platen, means to secure a master copy to the curved platen and said master copy.

3. In a duplicator a frame comprising a support for copy sheets, a'curved platen, means secured to one end of said platen for operating it, the other end of said platen being arranged to co-act with guiding means in the frame for controlling the movement of said platen and means located on said platen 'for attaching a master copy of matter to be duplicated.

4. In a duplicator having a frame with curved guiding means formed therein, a support for copy sheets secured to the frame, a curved platen, means secured near one end of the platen to coact with the curved guiding means formed in the frame for controlling and limiting the movement of the platen, means attached near the other end of the platen by which to operate it, means coacting with the platen to give it a predetermined and uniform pressure at all points of its contact with the copy sheet support and means to secure a master copy to be duplicated to' the curved platen.

5. In a duplicator, a frame having a support for copy sheets, curved guiding means formed in the frame, a curved platen, means secured near one end of the platen adapted to co-acfl with the curved guiding means to coniine its movement to a progressive rocking movement from one of its ends to the other and return, and tov prevent any lateral and longitudinall movement of the platen at its points of contact with the surface of the support for copy sheets and means to cause the curved platen to contact with the support for copy sheets at a predetermined kpressure which is uniform throughout its entire contact surface.

port for copy sheets, a

8. In a duplicator, a frame having curved cam shaped guides formed therein, a support for copy sheets in said frame, a curved platen moveably secured in said frame, means secured to said curved platen adapted to coact with said curved cam shaped guides to limit the movement of the curved platen and to support it in its nonprinting position.

'7. In a duplicator having a support for copy sheets, slotted guiding means formed in said frame, a curved printing platen, means secured to one end of said printing platen adapted to engage in the guiding means of the frame to guide and control the movement of the platen and means to secure a master copy of matter to be printed to the printing platen.

8. In a duplicator, a frame having curving guiding slots formed therein, a curved printing platen provided with means to movably secure it with said guiding slots, and means to supply a predetermined pressure of the master copy on the copy sheets during the printing operation.

9. In a duplicator having a frame, a support for copy sheets, guides at the end of said support to position the copy sheets, a curved platen, means mounted on the platen for securing a master copy to the platen and spaces formed in the platen to receive the guides during the rocking movement of the platen. f

10. In a duplicator having a frame including a support for copy sheets and curved guiding means, a curved platen, means secured to one end of said platen engaging and coacting with said curved guiding means to control the movement of said platen and means mounted on said platen for attaching a master copy to it.

11. In a duplicator having a frame including a support for copy sheets, means for positioning copy sheets located on said support, a curved platen, spaces formed in said platen to receive said means for positioning the copy sheets during the rocking movement of the platen, curved guiding means to control the movement of said platen and means to secure a master copy to the platen.

12. In a duplicator, a frame, a copy sheet support formed in said frame, a curved platen, means for securing the platen to the frame by one of its ends to permit a rocking movement of the platen, means secured to the other end o1' the platen by which to rock it and means to secure a master copy to the platen.

13. In aduplicator a frame comprising a support i'or copy sheets, a curved platen, one end of said platen being free and adapted to be opera.- tively engaged and the other end of said platen adapted to co-act with guiding means for controlling the movement of said platen, means located near the controlled end of said platen adapted to apply uniform printing pressure to 'said platen and means located on said platen for attaching master copy of matterto be duplicated.

14. 'In a duplicator, a frame comprising a supcurved platen, guide engaging means secured to the end of the platen lcti-'actingr with a curved cam face formed in the frame adapted to guide said platen, means 1ocated on'said platen for attaching a master copy of matter to be duplicated and pressure means mounted on the frame adaptedto apply uniform printing pressure to said platen.

FREDERICK W. STORCK. 

